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Circa 1959, MITTech Model Railroad Club.[1] Unknown origin; possibly from Cruft Hall, built in 1915 as a gift from a donor named Harriet Otis Cruft.[2] Cruft Hall was the radar laboratory of Harvard's physics department during the Second World War, which contained much old and unused technical equipment. Possibly blend of crust +‎ fluff, both of which may form on old abandoned things, or influenced by crud.